Finally borrowed a power supply to test that the sensor and ring worked together. I didn't have an oscilloscope, so no waveform, but using a multimeter I could see the voltage alternate between supply voltage and 0 as the ring spun. That was kind of the last box to check to make sure this would work, so I'm basically considering this solved. If/when I grab some T3 uprights and do the final design, I'll update and upload the drawings for anyone to copy.